SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eeb911ac54e27f6a31d36a1d1c4e66adc6ea2b16d8b040b1e1ad009b8669f3e' 
  AND token = 'X8JaFqws/KkFWGoT39QCWkqho1NcysPG8kuHNjg0EZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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