SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dcc3e9b991508b2fcfe202a808a92f0333f31e33e509be50fdbea7d7702089' 
  AND token = 'YjpeTzOTXL2WLi4YHw7/UR9gxr1CAfSQB5nBO7X5CRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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