SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6ab7dd13ec5d38ad2630f152efc86cf5875e08672f2890b35cbb7c812db1d4' 
  AND token = 'e3Jv6ENKHkok79myVZqQFf6aVoUJ+xtMCYx0FH8NxzU=' 
  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