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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da8f65d14c19e7633364ad837aefeec73c747ee5260a3b72afd1b81cd09d786' 
  AND token = '6JgQW+1Y+rG8bODvzHiMPEo8PIhLm42gNeavo2sQFsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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