SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bdf30b0d0c53f43faba9ea5f9c4ac618522bd0b23c16664e04b53a0e0d8483' 
  AND token = 'uU1wtWILPT444dYez+rmYPqI80KXvZuh+/MPKGnycJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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