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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1c014b073c4f99ca5df772afc22737b8b9ff4a952b0eec973304a0bf642168' 
  AND token = '1+4FZSY5PNPF8w5vZy3bx9zMFOVfR00GVtjuRsW1nPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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