SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5576df8b07ff47448a7ba5a276ef5d1753d46613aeb60d100e83a7a4fb736ed0' 
  AND token = 'Gl8TeY6XHSKGIRMxinDKXb/m1RiYRmg4HtaZ8HyIpXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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