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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cab6e6939cbb5606f69de2c0dd9bde263b16a620530086c443e6ad1b34b5f63' 
  AND token = '9uojVsKTluvHCVU5G3LaaUFEhZRAuUDcfSxmI9nVgyI=' 
  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