SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eded551e55202d150ff7959ac671d9c2d8c363a428b60d41b5dcec3de191be72' 
  AND token = '4/BhYZJC1l1r1HjnZD4ouGLwrYo0QMxw3DZ19EouTEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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