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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c837a962eec580f5a82a7905095b2ee3af18ae7316d590686b252dd8a62ab585' 
  AND token = 'cD8nhR3cNOFtX2j0NsJvuhx0ezxjzQmwxNqQuU7r9vY=' 
  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