SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21f96902e83973b4ac10afd7dca018adc791904521c6e9f79efb25d84b9a1175' 
  AND token = 'Lv/ILnttZxHSwssrCJg3fLMQnWDGi8deKG+u8Fm3qKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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