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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e733a55e6ca300ac285eab3f039960cf0d5203199e16bc38288035a2b4ca84b' 
  AND token = 'RXsQSyc8bA4xR4AIQdzosB9Wnul+t7CdwUHUy7y8fZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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