SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee3e98fed0d40cc2471a5cacb2c235005b10db4c786ec5ab746d01584d7e312' 
  AND token = 'TA1DWVdWcdV0Zof5QHPdKZEX/Jw+yOC1tdXP380dEpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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