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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '188bc4b2f29aab4822a723928c8a702573e12e721a6e89c923cd4066bbe34de2' 
  AND token = '/aKVTn8RFT4i5Fo6irfrL0GrOAoTDydqDEvMIeEeaME=' 
  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