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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e464373083aba452a6e025466a895ad9b1b9c8578ae18850218e446323906797' 
  AND token = 'EQ1ciJhLBfCjNkUh4joKmDkNwZLJQ1sEBXuB5YSn1ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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