SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '382c7a7e3727d598b46c5a989364dd07e37fad13d9acfeade677b116269d00a9' 
  AND token = 'PC/MvqhGQaPkAIFWXOt+jUdR8wl2pGKlKukLnciQOlY=' 
  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