SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3561c702f79c25113ffcf900cd0205e858b0ea3cc7abc73977e730451db22de' 
  AND token = 'R7scCINGG7Ll9/Igy/tGM8x4zGoyM/G2/F/UKUbKaOI=' 
  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