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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab484f06bf740206a9714b88cfee9b947f65e4eb900821205b4fbd3f119dde8' 
  AND token = 'J7573Dm+PyOw8p3hWrYdZRgWIXdkvlt2UZsuBZP7NuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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