Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c8c701b2d20209cab8cb72ec4e39986155ab2a20749d245910270a03ac972a' 
  AND token = 'xvhILBTIjvfexGIHpuIIzqOSJRSwMWTFcOVTZD34Nkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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