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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd898b114c5cf806e669687299b981b1a6c0cb7e75da796d1066959c0afb50b26' 
  AND token = 'dH8nXSdJ0iRNiu3aDoEDq3FD8XJdR8chSq4GWRx2s7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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