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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf867a0d5f8c2c7b54b7e74b1ad6bf5e2a4ab25f96e4420e16ad2a5d7b866df' 
  AND token = 'UR/CqohC5KTY97ESJnBP3z8wOHq56wPykdTMS9rHTyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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