SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d63c20ddb52f185a1384fee0c8a3b6b0359f47a3a9314b1f48f4274df1f9bca' 
  AND token = 'nkkpeQCHEkXTRGlDnyY2vSh8N56AM6PEkrvWiB1li+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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