SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b059453078316a1fe37b0901c15361f5a24ac6cf76e6bea79d851918fe63325c' 
  AND token = 'oibsW+fdCBVhy6yMr7Mg7ITsVZ2KQjKN6MM8HvB1cQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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