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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2665239ed26fa9996c13decc0bad0129495e180b8c168b777581c1fc69020797' 
  AND token = 'qIXzkXrawrH9b2aWXpyeu6DApbzpMMtOU9j6yvMXfRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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