SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b125610818094914472d2bbf8eb7f59ec6b1695c55d98ad9c5c7f0dcd9fc9622' 
  AND token = 'pn58vhfjI1rj+cBPNiRn7Q+Db0xl0ljqPM1WfBs6wKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

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