Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c49963f0ad503955dc29dc6390b1b318eb9e56d6c07130a050d7a22691ed88ad' 
  AND token = 'YGq7VqY/itNAiRqxIRCvrCi24tYVGuj6QEvqI5mihlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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