SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb1282acece30a04c87c95376f717ea570d7fcc4b15130809be08ba359c7daa' 
  AND token = 'iO/Cdxhkf4ULbW7a/KdctroV51DbeEt+fiIStFz5bIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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