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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084cecfbf7575e99a3c0b3ef0d867f71d6e40906af9e44f93c86ae338ebe7df8' 
  AND token = 'wz6eicmyM5oI4eLMdxdDM/qCAOjIIPNNfmQ8Pw6U8OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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