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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f1308c520c9baa61d0ca3d5c605314de2ae304fa36c6cc91688d44dadef260' 
  AND token = 'nL4IYLUqAhDr4HGwDDKAzT8RonqaDs4NSQuUU9IBS9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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