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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f74c718441cc580387a7688324af44096c7f0a93abf4ec58e06ac7ec0b5c97c' 
  AND token = 'OJuVItLtON0q1gm36hhiA1t26KCswOP0Dm1SzLWzst0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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