SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7af9856ad0dd1511f177dd4ec6932432a88c17865d40345e9e40b6277b7b125' 
  AND token = 'k+nS3XLgybdPS7qypgc2Lmg6ijyRmiEvTChJS6l/Zbo=' 
  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