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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda576ddf7d9080f4ba7593b12cafe271b9038aea8fcdfd24a94e7d2e406d848' 
  AND token = '6sgbqSMyDhNYSyujBQe5ipmtqZS3S/Kp2ZFuiT2LYw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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