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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a537fca63a12b4fca65720e87a9f1d82a99ac35dbb74f2ecdf640d393291244' 
  AND token = '/UroOI8pUL0OhbQqzDWmSECrQ12IciAisDVMPuGhuiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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