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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735aaf609cc75c8edd105ab459b86c56b61c73f7c402ea8136aa2bc7aeda2309' 
  AND token = 'OgT7SD8XFD6QTmj9lf/yMesNLrmdXmpGG6Y6NH+iMmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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