SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ab07f4adc8a398842f8c88b9ee75b9fd5b3efa090e165d68d0662bf488b98b' 
  AND token = 'wh3+2fAJVEhINRdefi5oDXQf57YErn9A19PRaZjj7WY=' 
  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