SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efffadaf64010dc47318b68a37697a7f77eb784a2d2628e78c68d11ea364f5cb' 
  AND token = 'Zo17Pe/bTOAi3j4KDBaDuywaZiErnJIeqYY1xpAuWZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

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