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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198153dad2baff10e48fb4973d1720a61f3760dedb5f43a43ac6909a797488f4' 
  AND token = 'WA7rUmbpXfveXKRya7lc72CNpU2nhA2AaT9Jg6krf3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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