Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15aa3a70fc288504dce0497df8d7f714edc4384976da90743dfe19e078a75fb2' 
  AND token = '6xMoQB+NzhzjSTz9bA9pyUGH3EZlbYq2AcpCXL92jSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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