SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecdacb63fe298245ade931218f306ddf3e3e01a7dbf5c652f9765005f08b18a1' 
  AND token = 'IUJLRGZD34dpgRyf79BUxl3/3Kjgq8/ht+3w4d/NvIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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