SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695853960c3ba7e8e3498fb56d369828bbe4564dd137f5f6d2c6fd1e211ebe77' 
  AND token = 'mJ4WwrG4SFoIgYmZfZdPTCMtwViOw4D8AsvcT+odsZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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