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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bce4d18457f687197c0773d13a0ee1b7efb76144a4d9e2603399df594e6269e' 
  AND token = '+kOKTcU8MFLsNSzQ5DQJuxlt62h4M5FQ1YNWAZiLmxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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