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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0dd6a200e1425fa4534c61ed141f26af45ff26e0795996c16fbca6c6fd5e6c7' 
  AND token = 'ML2ChRuil6w32nJG7F2zubK120tFdvMf6bPjJ/vafBs=' 
  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