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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee48f8ac8fb30a14aa8ae534289dca5540a9367dede8386102f21bf44097e30' 
  AND token = 'wWej2RCn3pHUYI6ovUC8bdYGXdSjPQ+Y6PhBnBVDbag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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