SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df96aa2969dd76152ab5f2ced9b8674310d7400a340f2a1ec0937376cb22132f' 
  AND token = 'nVo3xp/K7IjEFzucl0tBcDUAvY1BLedZV4AqQYElMrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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