SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7bd372147f4534fd9ab0c12f79cf154b53f24e57a50846ef947d3714ea420b' 
  AND token = 'yrTvKBfp0iKWo0qlOKZXsRXJoiDU+jtIsvzg0JZYNY0=' 
  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