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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4378a030be54780c7a814cc577f2c62da24c5fb8aa0ee205c0f9b9289a292a04' 
  AND token = 'zxb4MKhzaxstPMSMlYJduO4ZM1KRLalUAKyFYM51cSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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