SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06e4510d81f03041be87d6cb9bdcf894e2058a93ba895bc5b9bf57b1aba4da8' 
  AND token = 'dR0i4mrK1jR9HapAq2aBo9KKMWADa2l5RASx203N/Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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