SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64955a34b129cf2bf8f7550ef82230357574d3d21f9ecb8e3db4655146504575' 
  AND token = 'MT7Iw64ux2qohDSUjT+fTz3GQRBYNIaGVYmwj+HhTWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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