SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b7440c14b0d2db87ba1666a26a57c168cb85637609a7b6a494673856cf6004' 
  AND token = '1CoJMagQgCNO0eUrrV7B7/z7aZOSx/wroUVeadu6YGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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