SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c58f80e862fc672da648ac14fcab0af6ba1b31d73b3196792a3c53d613f7d4b' 
  AND token = 'dSy1JejiarzGehemwDYHTLGKIZDUlALG8+UVuozNdEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables