SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1bf126650d6361319bcef4fd1e4056f9aeab6f80cda37f5dc9912fabd89b266' 
  AND token = 'jhTkDUKfzSsneWZZVSl1XBqmK0lGPxdb3KH9UVeQhvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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