SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b27bad6edaed2404c2c3f55f4751f92d436d787613f5e53daae7d120db698ab' 
  AND token = '82w/9/5bfnNRNH39+rKgm5zgqrWRmgAIAlspOkxiuZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

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