SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de03ff430c4977215bf3c46a737eee92dd0caaab50d4b8c0c11b1e3fb088219' 
  AND token = 'BhJdou21+D0IKRLtYgnKzEeL8ukJRTcznd9KVIsnEaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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