SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606d2aadb0d49a5b16b46a39313b9ef9fd9ae7270401b8512e8fdcf6813c3709' 
  AND token = 'ongw/tDlMFJjQNT3rX+KxcCQFDKZlaFYSvmQl75tJ34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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