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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3067a67ff75ce1b5cfc701cb94c6bc5996370c55187a2895a3f9a4ff0f9c34' 
  AND token = 'u1KwIgxtwm8ljCXOTszQalRQgnGS5ly3OIiEMQRtMMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

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