SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56ea1d87fa3c0d984ae9d256282cba852c57ca5d4cd742ee2ab38a16beeb3be' 
  AND token = '9KoYtIGi+DGeyg08swqjrNPfljTrfx1RVJ8BVF6gwv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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