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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979d98523adcea3103fbf57205a69e3a9f68846d8cdedc818275d4a65e0ba8ee' 
  AND token = 'jyt21RGOsiHn/QlxRV/7NGTzHq+Pab/weXBCnUHQb6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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