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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91afc14e97e19116c412cd20aeff7ca6c249094f0ba7e7b1ed5a81f100208ee1' 
  AND token = '/LIEYAeHacnm8vG+yPKRQFvwQsUtAMg9Z8FL7CuWk6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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