SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22346af649798c92c64eaff877d6063c21e2d0ab8bc74c361debc9d5ff70c0e4' 
  AND token = 'YfjinMWgzzJLNA0VMJXIKNKj8UF3C5WbRIeZtunfzQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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