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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219619a5b2388ebe06e9464694b89bb442ad99f92136296d119d24d46cf56b99' 
  AND token = 'XPbTeeXQSd6NF7C8S/lhE9Ky0T2qGUup0oPZTrt7/A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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