SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783a6b8fab146aa1cf7fae92d96abf8a4a6b00516b298fa7f15d14abffcf82f8' 
  AND token = 'taUZ1eeuU4/C7wuHXO1woSTnb/Fak6o8oeCowxj+JtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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