SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf3ba3ac22db5fd4dd10bb4652c49f785331e62406b07301407477114017b7e' 
  AND token = 'IH313907OK4qQMyvx2+F2ynEC98E61BonN0UzjCEYMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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