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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3058cd3ba553cbf53586e2e19401cc666c4822c079e28db4a4b46f4da3516ff7' 
  AND token = '3SkGkTI8pzNxKm6efNpF5ypYl+e471TqpzUe3aTlP3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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