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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3d6cf270400c6802ad977f2720e492a41adbdd59601d65af60b37196881c2d' 
  AND token = 'LJ+s7g7sX9QpjJrA1NHik6aS9HpkD+/5N2wpVs+mLF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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