SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72e3a5df2e65bc5a894d84713567504216d95d85094914605e34c40ee6f4190' 
  AND token = 'yxl1wYHPegogu70TAaP/jiawacYcOZRVPH2z9S1eUac=' 
  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