SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96f4a2afc401e9bacecfa433edcfa206fbfb47cec0a9fb98e231a0fa98d491a' 
  AND token = 'hkTH55/uOCoLVygvWXB6j+fHDvOGkEHJQjIc3V3dTa4=' 
  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