SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c551247e0443ed3785b5827eae8fd085e874af4630654a1ae5a304535062ec' 
  AND token = 'vW5MhG+coaF8Mp2QkcnFKAhmdLbw9Ip2yzWNVmvurNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

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