SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a23eff05f165d423f06181cfd56b1faf3cd8ff87c08bddbcdd7e380a285c7e0' 
  AND token = 'x05jN2TswoI1bPEdg+QUZoIrxyKjHQoNh5IdMUU4ia0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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