SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c5400fea077fc61775de90d7051aacb62ebb3a62548c37ff9b24cb24a57bb0' 
  AND token = '8/iHYol78irw3HHoG402jLTGBJ941Ak+SVf7ihq/Pzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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