SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c6f8bd897508b0c358df6352d0e1db634929cb23cd557038e442f4d7c38e2b' 
  AND token = 'juyHw5nkRYtQKXznnWHSKZwp2ummMoRbV/uo9P3zp3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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