SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ced8bf4d1b792779676f6972fa4a9bf3f8f39c35fe9761953953faa2cff2f48' 
  AND token = 'bWLcsVf45GaPkNXjzMmIH9V+6LRuOJlIrcWjhZqK1fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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