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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34094eacb919d869e16c4137594a6d932ad066f017481cc96bcd9af55efa2f8' 
  AND token = 'mxDXG2YJX//AI0JyHixRagHhWD8Vgo7xoMyAnB+PWrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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