SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03cc74ec2005e59465c0777127606924a6b6be2c79425c22938a18061d16fe4' 
  AND token = 'irmhB+6QofUoTSAVwFPtC2LSmGq7zuh4hIZjmwqkZSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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