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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33efbaa595a2130921a1d3fcd8b20669eda5b11138c00bd27f6a56e1d262ef63' 
  AND token = 'dsqX7LTbv9G6VlgSouOUU5vSdawudFrMAqjj4RegZTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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