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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0032d7818ae5b51b7a4042ea0e4b4574fdf229a06ef2b20a122e69ea701ba7ff' 
  AND token = '6z2If26F8DjWKa8jASZ8Zn+tAHfDRiBU9umFmMp4I1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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