SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73311af6141d4ef4dad215f72a6b4c764b1903554c98ba85f3c6ffa5c95abec4' 
  AND token = 'LLgHZlcJ+iPEeY33u0JbJF4Chvp/lKlGyKn6nhx0/TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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