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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfcf599c09dca5b52f7e9f701b64d13a05f753a1e45719d6ec91df24608c2d2' 
  AND token = 'ZnvaemmKzW2R9zWUK1Seuvqu4RQd8in1f3iUvwAH1EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

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