SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a55680c8d4cb5f5b76dcb4c28a8ba49b9b8d6172ec3f81ba721c722e8eebda' 
  AND token = '7jpv65FxMz6sChUrZKYPENgWQ5RHzxwcx1v+FjLEqbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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