SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98a7f99490f5c32eb428b4e95edd9b7190c2927ae929abfb5e6d2e7da6e0013' 
  AND token = 'qTlzpIhgo/fMbCKdq5L+WDDBsOVgw/YWuhF830Q82vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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