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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd604778467329780cd4416334c6040b5785938e4ddbfb0625db7226342824f0b' 
  AND token = '6ys92aroFlB1hC30vAOhpUgAZ2kt53Tl0FnEmcITsaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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