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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5c0e6f23edaaa09edc17807beac8596ad6799e154b5e954c78a6b5aa328a88' 
  AND token = 'PSU/2aqSiEVIMyHdriuSLJujuU/wVwuCgQIxpTPt7K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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