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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dcf5bc07fff08ebe3f44d1f110a4ebde1a2e2486944dfe2fd9c4b59c63f5bb4' 
  AND token = 'M8oTXSbhl5w/Ab3ZujuHPXKp2J4WeuKimPc+/OLkFqg=' 
  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