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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63719a28e1df336143e56a334cbdb0a9a93cc7ba81d3e4b27dfd4e395b2e52f8' 
  AND token = 's1MqhpDycVsi0a7bQEXbwGgfaHZLPRSsF3QbS59Fvo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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