SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44b6162b1761f14fe168794f419a58c209201a029c5806a2314d412fb933a63' 
  AND token = 'zh6UCLWHNHx/JuKU/I5jdN5XkZmhqGXL9ExSIqpzonc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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