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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea32e618df06664db536364e0f28eba9534b7cb96b62e60beceb0e2cba9dcdc6' 
  AND token = '7zpyPfrK8w/X3O4VcxXG15qccwDhUMXLFqJgP9+dXVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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