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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897df985690bf080e80b85f6906e438a8e5282f8d00509161c9760e7423c20c8' 
  AND token = '+7MNgXcMHwm5spYeq7/yHSbCdD5tJDxRsTWE10r9E0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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