SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc85ef008b21b8cefc1d11b0aaa164c521488028d2d63220d2ebb22f146bf14' 
  AND token = 'i3aEBSbmZVrHPX/2l7iJN1s1l+pMj4eOe5zlsQt2B5g=' 
  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