SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb054823136417b97468f9282dd692caea8c370154d5fcb7b2e662c2032d6a2c' 
  AND token = 'L8+/RlMNkUgTAjcM/nCW+Z9Ts4AxqfASzeTdQkbUbr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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