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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69e9178dcfe892e0fe690f8f3562a0ebf006a4ac245f7170e1125ebf6d93d42' 
  AND token = 'aYx88EhE1NKtR1iiP7WxThegSbsXIo55p+fjJU5yldY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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