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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2696db7f3b6972598e17f55798c77226e2461012987f4e33d7004a42987d16a9' 
  AND token = '8VEswG0e7D5RreMFH5tgdpCShcKLe2oezmk8fSvFucQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}