SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '454a45b0f745b1a89f77d0856b1828afd73fc3cd041c38bb266820e7d55baa4e' 
  AND token = '5br6Ykh8Bo84I49vGb6jsl5Bx+LSvWJwaEFUc1cTJeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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