SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170dc5e9fd988fb08621ec784a172ca6e885504d5c2aa6b8bf93b081dfdff98e' 
  AND token = 'qF0077rPH+qRTXmZzhLgP2kLa81eohRSHGWs+TbAGlI=' 
  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