SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7d95dca95e2d9de4422840673ec0c5a1d4554d44e92d5ebfee60e2576884df' 
  AND token = 'Hbd9wzCTDz3/3DcV0xOY8SwpjcaHHIUSTRzwOHw4Zew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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