SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03eebe6933067431e235e3443ad2eb910a46f7447f52f302eb48dbaa89bf146b' 
  AND token = 'La+PAZ1l4AsgeiKYUkdnKDK/4lfYCK1BGgFl8Bk5tck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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