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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907d6a52ce3d71b024f8ed19edd828be4f5961b113699627f265f5d7db28b06c' 
  AND token = 'W9NqcXrTrSg7AGxihEKS8J4lcoo0TPY8egrHzuFjKq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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