SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe754c25f82862c5df5ec7c9598fc33fa05c1805f4dabe8ec35573f49adc480' 
  AND token = 'kcxkQ+VbdE4PPEfG92oFpxLYU/Pg+yCUjawDH0iPdUo=' 
  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