Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4258576dedce6f4daa567d021e35c6b27fe9642c993ba7649e01ee60ede80f9' 
  AND token = 'moB3zK8KR4igQVwdNjDylXERJqI8grRUS1R0pdNiJV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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