SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6271011a07226c8c793fde14f09692508c24b9ed64728a5b4baccab05a47ed' 
  AND token = 'XdA6cquV9gCP6n+pQ6X7BgF6O/4+IRjLoonlEAieaJ0=' 
  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