SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e286e5e5750ea83c32510d1d7b4ba3a580ad519953e50de4b0cbb6fce4ed4d62' 
  AND token = '25Ssjb0VIOjYkl5prRo68GiRI7kL5Qp8BR/HT1A/eLM=' 
  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