SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf8800dceec3dfa3afb01528eee17af1a845e0e046666249a93614ff1b00b17' 
  AND token = 'EVVkNXCVVog/dQCksqC1jfk4oMWjwMDHqjIb1uw0Hhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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