SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80482f1747e4d4e638d6688959bbf25121d2956d7369394b1157ec30a8581833' 
  AND token = 'uE+3VzvLkisc5YI/2hRveqqAKIf0WGxPIko2+u9yuBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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