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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bfcb171e43f8ac06ff9a507637ded29e05b00785dded64d637fef1cf7adb03' 
  AND token = '47m4GtM3t8EXUTg37ThZbgAYsv+5qry+YpsaBJVgy40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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