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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941034feb39e86b6a3ce7f64ab620380c949500be9e9f24f234976c9c684c897' 
  AND token = 'Nc9FbHVU32YNw63IP8anTiZPq7YvXBFcv+C8fTRheDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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