SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95da26d756c813b6f6b5edc69e3a880e1f69d4fa1dfd50c9c1002950c5e19739' 
  AND token = 'RD/JeIbiToUnyzDj79OPmclX5kMu7AvVxgwSnQ/zE+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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