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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae92929ab07376db13eb5c7b5f5c4c698d14165f3b55c2c10762933e909f7c0' 
  AND token = 'Day3U8RihwhwqxMJqLBrDjaviT237O1GtJ0zVOqHs40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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