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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28acc9e118aedaee5597183fd647eca56c46cba2ae24a8f55124b4051d2be90' 
  AND token = '4Qpa2TV8PEHNBx1RFW1L3JTo9N76bW0V6L6us5Peqhs=' 
  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