SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49705bb58e83a88d5acb99403ed0872f6118f0bdb4e767d11a5a2558912fdc85' 
  AND token = 'Sug2So1IMZhwzzAZe3wnfCHSQb+tXtpnLQLm9pKKl9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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