SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c651b3d5c74f64e0bff15b522f2bdbeef7ccc17dd1cd2aa0bd28b28bbe481cf2' 
  AND token = '2yG/9ZSw5bf5JiVNuQha2evketSN50gP87a/R5985DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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