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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f32ecd14f6845e377341d6cd9cc63115d9d296f658f73c3d3b99bfb4917a46' 
  AND token = 'pNI/PU0HBFVhcTz3uK/e/SfUiW9JyRiwJb4HK6wWN2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}