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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13caa034446eb9824da69c953917f198cb884b75c315e904229b2c7c6d5b9614' 
  AND token = 'XGs4vQP9583Rr6lyf1ZlI+DhqamnDk01oh6ljzzvS5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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