SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb53659dd926d8cfedff9b55cdc17899d5f7736b8d9d36b922f4993dcc90b30' 
  AND token = 'Es95bQgZvs9f/wmBCqY5XO+j5Cl2TUYjrPhxoDI6SuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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