Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198da873a0aafc7541de2901c197866be35e64632e46e26025c245c7aae0d27a' 
  AND token = '0zaazY40nAyU0m3KigRRg3F692/5V0qkA/MMzjLpnAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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