SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2862d41a8fe9970b6076120ef41b52579b0e46a51c17b7f9d0d4a58c58d72fa3' 
  AND token = 'EnHyhDvGk0KEuz/Ls1D2dg4S5mTotHwDqpVQNd2kbrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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