Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8eb81c09609f1711834a51c522c666278ac58f5db862b8d735534964586015' 
  AND token = 'K4FTwMuYy19kjvxslzXe8MG65a1k8Gih1s7wewre2+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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