SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb8630091e328b32b5557845848f8490078e7f9490fbf9bfcf951a56924b465' 
  AND token = 'AjZjMv1nYJxpEKJKQqdNNv6G7L9pZ2eci/D6dIsYRSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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