SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d29a9cd68d2c63569d9c2abc12d762bce7651af2931878c9b15c7f5d67d0111' 
  AND token = 'A+2TpPTUdhytEeXdqqI5zHajE/B6WXVYopJ8fMCv3fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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