Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ded3e518652dc88259fadda4454ce0302e8d5218a71b78d67d2fe46f4e0a15' 
  AND token = 'UarMTxl653ZXjdWcNN6QTuQzy0/dPcOc28w5IcLNY50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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