SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2dcb02badd54c3fdd07782760a0e53b525733ad6e47a94ac46d4e81b16933e' 
  AND token = 'tVD/GqwQsTS5HmojhzLKgd1WMHvKhks99kvst+sq3vM=' 
  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