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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9970c341327fdbf4a219124557b05f77da603f7eb107db00482b76cc91fd0c' 
  AND token = 'D3QyaPQOnIQ4zGzungIhMGDsIYRFWpzXS+A//t/ey24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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