SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b2afde2849a1bcb7e98430aef37524541c36ad07b43cdbca6db833ded383e9' 
  AND token = 'sKwwxY+p6jRDDHoCpEq/wsRS3i8iMyVakaicYV35RMY=' 
  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