SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695e5b4f4befd8ba25c67f31d052ab1e10bf14f3369cf425bef0a2f666dc7f39' 
  AND token = 'q33L42ZVo1QV7Be8nnxRuGH+QotAGgErs9641JrH/Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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