SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00199aa678cac8af58c9cb11a32aa8f709210f919b0febc94462e28af31ac7b3' 
  AND token = 'y7t/bxWJ1KPJwEbMqVS3wxCgo+6fBkYl+IeqG2jvPf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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