SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ecbbc7fbc2427126642985af2c065e21218b3c78b351826f2a222347bcd8e87' 
  AND token = 'xtN8MnK0jgQyuIOnBXfesRGZvV4+QE4GPHQsLYdwT6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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