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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a7a86f0a784d58bfcbdae38e3ffe9a1b05af35f29c89a3162d905e41373ec4' 
  AND token = 'o2KisiPN52xN1ef47N5WbAhrvNfzpwcDHDv244nLZjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

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