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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d579982777a0c57aa2c190240e41fa8e89c157505b768925ba08d1ff55bb772' 
  AND token = 'vpg73Y5bJUPwsGeR6FvUxZtfuiNSctif8RL5iVe7B5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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