SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546bf5cdde3716e355c8e628b724d748a218411d971abb3ebbfd1c05553340b1' 
  AND token = 'TH2Rtm0w0ZacmXsREADgALloWCE/5XmWKK3RGQVCFFA=' 
  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