SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18a16160d7445b0844320622f0b12e0f2ab923e6deca6cc9192ddecb1210567' 
  AND token = 'KbSOkDh7atb+RryyzEbXQeIrmzUyWvH+YJRXgrrkdig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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