SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a123e221ae41aba04c8845d3b71bb2917eaeae46fcb1796291006782802e0d00' 
  AND token = 'pXYsCq3l3rFQj41cjMQhaEpB+6jXehL9lYOVYPq6HfU=' 
  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