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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7f0bb5b8c38c74cac597e90c4ecceb4d233b4a483f4b48da6aeeb10ab6cc4c' 
  AND token = 'XEb5+OGPlILTwgOSw35vcS8fIRNN/GYogZ97Voxr/lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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