SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94a86f7b9284996a722040598e66b4adb5716ab8e7b57018e7f61a47c5d8c05' 
  AND token = 'f1/bwYG02WUDIjDOMqEPR4tjNJghXcLUsJVnrORRKtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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