SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110559d0b1e496ec498de1b3fbc47b6b2411bb3563e8de7fc936930cfad906fa' 
  AND token = 'euSnxb0Yrm8bE/xaEzMYE9ctFr4gDLZ6hhBfyHFY2WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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