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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d1042c25be067997bef4f8c314481a5db964e609e75a27d10fcc5f6e46438e' 
  AND token = 'Ts9Y7oPcDdWeEvdCJHxfFNhY+SbxPs7+KiMkeIUF53U=' 
  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