SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9737726e8aa3baee8eb8ad118a2d6395f5b593923b24f3400b1fac1fd94a92d7' 
  AND token = 'I1nKYdkrTA493D+CDkqxPGznzTxQYCAy6HPzsT05XTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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