SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6541ee2455e8d1e1fc6980aa4df86c90601dd40c8b2b7f4426b9a241fb86e3f8' 
  AND token = 'JeeefA9a9BFzHgzlA3DJiVS/uabjMRalgzlC8eCUh64=' 
  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