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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90791ab250320b3f2853fa3f8cf7ed94b2ffc00d636fccfc9baf8c870f69978' 
  AND token = 'jbWCy2Gqp9eDHGY8FJAJyaurqZN33ZSXx31C5SEW14A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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