SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c454976398a30cdaf3d1d055b1f86a6a2c3446006b2b28fdbad39e37c064ff' 
  AND token = 'mHMcyaOk6wW2KDYBX87ikSGZa+LPW5jJgSAl4MJE6fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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