SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626d3e26182ee7759f8ac000428ff56b39c7e2a0dc5ef6ff8d112b7e31b27383' 
  AND token = 'C91+aoDDB16YodeH7DCCCZrQWllPBQCspoyXKfoY7bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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