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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4195198ae4a313ae61e465c748423516d1d965fc1de7f26442a2773910f8b612' 
  AND token = '9T/Gvfk/g8lJoabK8UyX7nTkWb2QrihQH8DG2uyqjSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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