SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45b26df3909528a1674c27c16fc4527156d29f6125d2c77d31defe9e1821d91' 
  AND token = 'V4++BFrF6sCwHiUtRkPZHGtYKEKIz74PCSRTl4FXRwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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