SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b80a1084c6e5bc08d11d94b5a697fed07b5edf346511e530306d519cb62c58' 
  AND token = '+2Lf5oVGjzq1nOKjsPFZ/ZslK1MuPABfZkDjeYbMXmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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