Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e144e75f40697c2a48909407c391450feaca751152b1bcc0b61d7e9eb4b50f' 
  AND token = 'lRiQp2cwNAkWJ2igWjSOqb6LIo/aYl2EWSZJBH7pBZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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