SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba705b49eb92705cb4c4b400d4db0e0969a9c640c56111402a041e550d164da' 
  AND token = 'cDT082xnxZmlWrxYUHPh0mfgwvQGml5usLu8+id0Ej0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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