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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab432a016a2c4ecb3b39fb2b0ac2d193134d39924115cf1fc93d14132b85e55' 
  AND token = 'qyF6VaSHrUh0/gAN9z9lCSj9MIVqIFfH8jGod2YTy3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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